Peugeot 406 Gearbox Replacement Parts

The Peugeot 406 ran from 1995 to 2004 in a single generation, with a facelift in 1999 that updated the styling but kept the same basic platform. Whether a gearbox from a pre-facelift (1995–1999) car will cross over to a post-facelift (1999–2004) car depends on the engine code matching, and there can be ancillary and mounting differences across that 1999 boundary that aren't always obvious. Always confirm cross-boundary compatibility with the breaker against your registration rather than relying on year alone. The engine code from your V5 or a VIN check is the single most useful thing to have ready.

No — diesel and petrol gearboxes are not interchangeable on the 406, as the units are engineered around completely different engines with different torque characteristics, bell housing designs, and ratios. You need to match the gearbox to your specific engine code, not just the fuel type broadly. Pull the engine code from your V5 or a VIN check and give it to the breaker so they can source the correct unit. Never assume a gearbox fits based on fuel type alone.

Trim level does not affect gearbox fitment on the Peugeot 406 — the LX, GLX, and SV are trim grades rather than mechanically distinct models, and the gearbox follows the engine code, not the badge on the boot lid. A gearbox from an LX with the same engine code as your GLX or SV is mechanically the same unit. The main differences between trims are cosmetic — interior quality, equipment levels, and exterior details — none of which affect which gearbox fits. Confirm the engine code matches and check with the breaker on any ancillary or mounting specifics against your registration.

Yes, this matters completely — manual and automatic gearboxes are entirely different units and will not interchange. You must source a gearbox that matches your car's original type, as the drivetrain, ECU mapping, and ancillary connections differ between the two. Check your V5 to confirm whether your car is manual or automatic before approaching a breaker. Confirm with the breaker whether any ECU pairing or coding to your vehicle will be needed, as this is something to clarify against your specific registration rather than assume.

Year alone is not enough — the Peugeot 406 was offered with multiple different engines across its production run, and two cars from the same year can have completely different gearboxes depending on their engine codes. The engine code is the single most reliable detail for matching a gearbox correctly, and you'll find it on your V5 logbook or through a VIN check. Ask the breaker to identify the engine code from the donor vehicle before committing to a purchase. Without that, you risk buying a unit that won't bolt up or match your drivetrain.

A 1998 unit is pre-facelift and a 2001 unit sits in the post-facelift phase that began in 1999, so while the engine code match is the most important factor, there can be ancillary and mounting changes that occurred around that facelift boundary which may affect fitment. If the engine codes are identical, it's a promising starting point, but you should confirm the specific compatibility with the breaker against your registration rather than assuming the match is clean. Breakers with 406 experience will often know whether that particular engine code saw any running changes in that period.